当运行带有嵌入式引号（源参数）的命令时，Bash脚本失败 [英] Bash script fails when running command with embedded quotes (source parameters)

问题描述

我正在使用 source 将生成的变量插入文件的字符串中，以便从bash脚本执行该字符串。

I'm using source to insert generated variables into a string from a file in order to execute that string from a bash script.

我已经回显了生成的字符串，并将其与从命令行运行的字符串进行比较，我似乎看不出有什么区别，但是bash命令失败了，因为似乎所提供的参数变得混乱了

I've echoed the generated string to compare to one that works from the command line and I can't seem to see any difference, but the bash command fails as it seems the supplied parameters are getting mixed up somewhere in the middle.

我在ice_name字符串周围转义了双引号，因此它看起来与在我回声它时起作用的字符串相同

I've escaped double quotes around the ice_name string, so it looks identical to the one that works when I echo it

我是否需要转义其他字符？

Do I need to escape other characters?

在之前 -ice_name 参数

这是命令

avconv -re -i test.mp3 -c:a libmp3lame -content_type audio/mpeg -b:a 128k -legacy_icecast 1 
-ice_name "Raspi Test Stream of MP3" -f mp3 
icecast://:[e-mail]/my/mount/point/url

否确定是否需要源文件，但以防万一，在这里

Not sure if it you need the file beng sourced, but just in case here it is

#!/bin/bash
#
# stream.cfg
#
# WiFi Settings
#
wifi_name=mywifi
wifi_password=mywifipwd
#
# Icecast Server Settings
#
icecast_server=icecast.server.com
icecast_port=443
icecast_mount_url=/user/mountpt/url
icecast_show="RPi Demo Show - autostart"
icecast_description="Test of Stream from RPi USB Audio to Spreaker"
icecast_user=""
# Source password
icecast_password=sourcepwd
#
# avconv setting for Raspbian Jessie Lite
# may not need if you're using a self compiled ffmpeg version
#
icecast_legacy=1
#
# Stream Settings - probably not safer to go higher unless great internet connection
#
stream_bitrate=128k

用于处理配置文件并生成流命令的脚本

#!/bin/bash
#
# autostart-settings.sh
#
# Load in config file settings

CONFIG_FILE=~/autostart/autostart-settings.cfg

# Check if file exists
echo "does file exist"
if [ ! -f "$CONFIG_FILE" ]; then
    echo "Config File: $(CONFIG_FILE) does not exist"
    exit 1
else
    # process settings
    echo "running source on $CONFIG_FILE"
    source "$CONFIG_FILE"
fi

start_cmd="avconv -re -i /home/pi/test.mp3 -c:a libmp3lame -content_type audio/mpeg -b:a $stream_bitrate -legacy_icecast $icecast_legacy"

stream_parameters="-ice_name \"$icecast_show\" -f mp3"

icecast_setup="icecast://$icecast_user:$icecast_password@$icecast_server:$icecast_port$icecast_mount_url"

test_cmd="$start_cmd $stream_parameters $icecast_setup"
echo "Testing command: $test_cmd"

# Run command
$test_cmd

推荐答案

字符串不能转义换行的字符；它们只是值中的文字字符。您需要为此使用数组：

Embedding quotes in a string does not escape the wrapped characters; they are just literal characters in the value. You need to use arrays for this:

cmd=avconv
args=(-re -i /home/pi/test.mp3 -c:a libmp3lame -content_type audio/mpeg -b:a "$stream_bitrate" -legacy_icecast "$icecast_legacy")

stream_parameters=(-ice_name "$icecast_show" -f mp3)

icecast_setup="icecast://$icecast_user:$icecast_password@$icecast_server:$icecast_port$icecast_mount_url"

test_cmd="$start_cmd $stream_parameters $icecast_setup"
echo "Testing command: $cmd ${args} ${stream_parameters[@]} $icecast_setup"

# Run command
"$cmd" "${args[@]}" "${stream_parameters[@]}" "$icecast_setup"

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